Re: How to plot outline of overlapping circles

Hi Kristof,
here is my solution.
a.) First create the outline of the coverage "limit_0.xy" as a polygon 
with psmask and "-S" & "-D"-Option.
Assumption: all VHF have the same range.

psmask VHF.xy -Dlimit -I0.01 -JM10 -R0/5/0/5 -S100k -K > tmp.ps
psmask -C -O >> tmp.ps

-I     increment of polygon
-S    range of VHF


b.) Then you can plot "limit_0.xy" with psxy.

Martin



On 09.12.2013 13:44, Kristof Koch wrote:
> Hi Jim,
>
> I thought of your idea
>> […] to plot circles filled with red, then the same circles
>> filled with the background colour but with a smaller diameter […]
> as well.
>
> Unfortunately, these boundaries are not exclusively over water. On land, the idea collides with the terrain elevation data. Another problem with this approach is the line thickness. On average, the change in line thickness due to projection distortion is negligible, but it looks quite strange in the more "extreme" cases (i.e. close to the Poles), depeding on the type of projection used.
>
> Nonetheless thank you for your swift answer.
>
> All the best,
> Kristof
>
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